The causes of fetal hypoxia are multifaceted, mainly due to the following three reasons: 1, maternal factors. Insufficient maternal blood oxygen is an important cause, including insufficient blood supply to the tiny arteries (such as hypertension, hyperemesis gravidarum, etc.), insufficient oxygen-carrying erythrocytes (such as anemia, heart disease and heart failure, etc.), obstruction of uteroplacental blood transport (prolonged labor, emergency labor, improper use of oxytocin, umbilical cord factors, etc.), prenatal hemorrhagic disorders, trauma, etc. 2, Fetal factors. Fetal cardiovascular system dysfunction, intracranial hemorrhage, mother and child blood type incompatibility, fetal malformation, etc. 3, umbilical cord and placenta factors. Umbilical cord entanglement, too short, knotting, twisting, etc.; placental hypoplasia, expired pregnancy, placental developmental disorders, abnormal shape of the placenta and placental infection can lead to the occurrence of intrauterine hypoxia.